What is a klystron tube used for?
A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier for high radio frequencies, from UHF up into the microwave range.
What is klystron and its types?
A klystron includes one or more cavities, which control the electrical field around the axis of the tube. Based on the resonant cavities, klystron amplifiers are classified into two types. Two cavity klystron amplifier. Reflex klystron amplifier.
What is perveance microwave?
Beam space charge is measured by a quantity called “perveance,” useful in the design of electron guns, and defined as the ratio of the beam current to the 3/2-power of the voltage.
What is klystron mount tube?
It is a waveguide of suitable length having octal base on the broad wall of the waveguide for mounting the klystron tube. It consists of movable short at one end of the waveguide to direct the microwave energy generated by the klystron tube.
What are the elements of klystron?
The essential elements of Klystron are electron beams and cavity resonators. Electron beams are produced from a source and the cavity klystrons are employed to amplify the signals. A collector is present at the end to collect the electrons.
What are the types of klystron tube?
There are two configurations for a low-powered klystron. One is a low-power microwave oscillator (Reflex Klystron) and the second is a low-power microwave amplifier (Two Cavity Klystron or Multi Cavity Klystron).
Who invented the klystron?
Sigurd Fergus Varian
Russell Harrison Varian
Klystron/Inventors
The brothers Russell and Sigurd Varian of Stanford University are the inventors of the klystron. Their prototype was completed in August 1937. Upon publication in 1939,[1] news of the klystron immediately influenced the work of US and UK researchers working on radar equipment.
What is beam Perveance?
Perveance is a notion used in the description of charged particle beams. The value of perveance indicates how significant the space charge effect is on the beam’s motion. The term is used primarily for electron beams, in which motion is often dominated by the space charge.
What is a reflex klystron?
Definition: A Reflex Klystron is a specialized low-power vacuum tube used to produce oscillations at microwave frequency. Klystrons are basically specialized tubes used as amplifiers and oscillators at the microwave frequency range.
What is a klystron radar?
A power amplifier tube used to amplify weak microwave energy (provided by a radio- frequency exciter) to a high power level for a radar transmitter. They are used in many operational radars, for example, NEXRAD (Next Generation Weather Radar) and TDWR (Terminal Doppler Weather Radar). …
What are M type tubes?
In cross-field tubes — also called ‘M-type’ tubes after magnetrons — the electron beam moves under the influence of perpendicular static electric and magnetic fields.
What are the characteristics of a klystron tube?
The klystron tube 2k25 is a single cavity variable frequency microwave generator of low power and low efficiency. It consists of an electron gun, a filament surrounded by cathode and a focusing electrode at cathode potential. The electrons emitted by the cathode travel
How does the klystron tube 2K25 work?
Klystron tube 2k25 The klystron tube 2k25 is a single cavity variable frequency microwave generator of low power and low efficiency. It consists of an electron gun, a filament surrounded by cathode and a focusing electrode at cathode potential.
What are the cavities in a klystron?
klystron uses special cavities which modulate the electric field around the axis the tube. In the middle of these cavities, there is a grid allowing the electrons to pass. The first cavity together with the first coupling device is called a “buncher”, while the second cavity with its coupling device is called a “catcher”.
How is the reflex klystron used in microwaves?
The reflex klystron makes use of velocity modulation to transform a continuous electron beam into microwave power. Electrons emitted from the cathode are accelerated and passed through the positive resonator towards negative reflector, which retards and finally reflects the electrons towards the resonator.